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SubjectRe: [PATCH V2 2/3] powerpc: Add support for swiotlb on 32-bit
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On Thu, 21 May 2009 13:18:54 -0700
Jeremy Fitzhardinge <jeremy@goop.org> wrote:

> Becky Bruce wrote:
> > I can work with that, but it's going to be a bit inefficient, as I
> > actually need the dma_addr_t, not the phys_addr_t, so I'll have to
> > convert. In every case, this is a conversion I've already done and
> > that I need in the calling code as well. Can we pass in both the
> > phys_addr_t and the dma_addr_t?
>
> The Xen implementation would needs to do the phys to bus conversion page
> by page anyway, so it wouldn't help much. But it also wouldn't hurt.
>
> How expensive is the phys-to-bus conversion on power? Is it worth
> making the interface more complex for? Would passing phys+bus mean that
> we wouldn't also need to pass dev?

I don't think so. POWERPC needs it.


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